#include <stdio.h>

#include <uv.h>

uv_loop_t* loop;
uv_fs_t stdin_watcher;
uv_idle_t idler;
char buffer[1024];

void crunch_away(uv_idle_t* handle) {
  // Compute extra-terrestrial life
  // fold proteins
  // computer another digit of PI
  // or similar
  fprintf(stderr, "Computing PI...\n");
  // just to avoid overwhelming your terminal emulator
  uv_idle_stop(handle);
}

void on_type(uv_fs_t* req) {
  if (stdin_watcher.result > 0) {
    buffer[stdin_watcher.result] = '\0';
    printf("Typed %s\n", buffer);

    uv_buf_t buf = uv_buf_init(buffer, 1024);
    uv_fs_read(loop, &stdin_watcher, 0, &buf, 1, -1, on_type);
    uv_idle_start(&idler, crunch_away);
  } else if (stdin_watcher.result < 0) {
    fprintf(stderr, "error opening file: %s\n", uv_strerror(req->result));
  }
}

int main() {
  loop = uv_default_loop();

  uv_idle_init(loop, &idler);

  uv_buf_t buf = uv_buf_init(buffer, 1024);
  uv_fs_read(loop, &stdin_watcher, 0, &buf, 1, -1, on_type);
  uv_idle_start(&idler, crunch_away);
  return uv_run(loop, UV_RUN_DEFAULT);
}
